An insult, a derogitory remark usually slung in the face of the kind of trailer park trash the world would be better off without (more often used with a southern accent). It describes the actions of a male of questionable decent(possibly having been born from the womb of a female dog), having anal sex with a chosen partner(probaly a cousin)..
n; One who motorboats --
n; Term applied to one who puts there head in between a females breast, moves there head side to side makeing a motor boat sound.